# FormKey vs Pruina

The clearest difference is price: FormKey at Free against Pruina's $2.99. FormKey also leads on ratings volume (8 vs 2). Pruina's advantage is rating (5.0 vs 4.5) and in-app purchases (none vs 1). On ads, monetization model, device support and iOS requirement there is nothing between them.

FormKey is free to download; Pruina costs $2.99 up front. FormKey sells 1 one-off in-app purchase. Pruina asks for nothing beyond the download.

Pruina holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 8 and 2 respectively.

## The numbers

| Metric | FormKey | Pruina |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | [4.5 (8 ratings)](https://appshunter.io/ios/app/formkey/id1535350561/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/pruina/id6793593593/reviews)** |
| Number of ratings | **8** | 2 |
| Positive reviews | 57.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Fortnightly | — |
| Monetization | Paid | Paid |
| Size | 88 MB | 3 MB |
| Requires iOS | 18.6 | **17.0** |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Polyhedra](https://appshunter.io/developer/1535350563) | [Konstantin Torsten Schutz](https://appshunter.io/developer/6778600016) |

## What reviewers say

### FormKey

[App page](https://appshunter.io/ios/app/formkey/id1535350561)

This app is an intuitive MIDI controller that helps musicians improve by using shapes for notes and colors for octaves. Its unique isomorphic keys aid in pattern recognition and chord discovery, making music creation more accessible.

**Highlights:** Shape-based note input, Color-coded octaves, Isomorphic key layout, Pattern recognition aid, Chord discovery assistance, Future update commitment

**Features:** Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FormKey Full Unlock | $14.99 | one-time |


### Pruina

[App page](https://appshunter.io/ios/app/pruina/id6793593593)

This app captures and sustains audio, transforming it into evolving drones and textures. Explore modes like Freeze, Smear, and Shimmer to sculpt unique soundscapes with effects like reverb and modulation. It functions as both a standalone application and an AUv3 audio effect.

**Highlights:** Spectral audio capture and sustain, Freeze, Smear, and Shimmer modes, Sound sculpting with Blur, Sparkle, Warp, Modulated reverb and spatial effects, Layering for chord and pad creation, AUv3 plugin and standalone operation

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is FormKey free?

FormKey is free to download, with in-app purchases available.

### Is Pruina free?

Pruina costs $2.99, with no in-app purchases.

### Which has better reviews, FormKey or Pruina?

Pruina is rated higher. FormKey averages 4.5 out of 5 from 8 ratings, while Pruina averages 5.0 from 2 ratings.

### Do FormKey or Pruina have ads?

Neither FormKey nor Pruina shows ads.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*